Cosmos Dev Series: Cosmos-SDK-based Blockchain Upgrade - x/foo migration handler

migrations.go

package keeper // migrations.go

type Migrator struct {
    keeper Keeper
}

func NewMigrator(keeper Keeper) Migrator {
    return Migrator{keeper: keeper}
}

func (m Migrator) Migrate1to2(ctx sdk.Context) error {
    if err := v2.UpdateParams(ctx, &m.keeper.paramstore); err != nil {
        return err
    }
    
    return v2.MigrateStore(ctx, m.keeper.storeKey, m.keeper.cdc)
}